2.8 KiB
background
Set the background for the embed, flatten and extend operations.
The default background is {r: 0, g: 0, b: 0, a: 1}, black without transparency.
Delegates to the color module, which can throw an Error
but is liberal in what it accepts, clipping values to sensible min/max.
The alpha value is a float between 0 (transparent) and 1 (opaque).
Parameters
-
rgba(String | Object) parsed by the color module to extract values for red, green, blue and alpha. -
Throws Error Invalid parameter
Returns Sharp
greyscale
Convert to 8-bit greyscale; 256 shades of grey.
This is a linear operation. If the input image is in a non-linear colour space such as sRGB, use gamma() with greyscale() for the best results.
By default the output image will be web-friendly sRGB and contain three (identical) color channels.
This may be overridden by other sharp operations such as toColourspace('b-w'),
which will produce an output image containing one color channel.
An alpha channel may be present, and will be unchanged by the operation.
Parameters
greyscale[Boolean] (optional, defaulttrue)
Returns Sharp
grayscale
Alternative spelling of greyscale.
Parameters
grayscale[Boolean] (optional, defaulttrue)
Returns Sharp
toColourspace
Set the output colourspace. By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.
Parameters
-
colourspace[String] output colourspace e.g.srgb,rgb,cmyk,lab,b-w... -
Throws Error Invalid parameters
Returns Sharp
toColorspace
Alternative spelling of toColourspace.
Parameters
Returns Sharp